Steam-turbine.



L GUBBLIG su G. PORNER.

I STEAM TURBINE.` AIPPLIOATION FILED DEO. 27, 1911.

1,063,510.. Patented June3,`1913.

I Invetor-s: Ludwig Cubelc Kiew-g For-her, bg Theirqtb'g UNijiED'Stearns PATENT onirica STEAM-runnin.

To all (whom t may concern;

Be it known that we, -LUiiwIe CUBELIC,

a subject of the King ofy Prussia, residing' certain 'new-and usefulImprovements in' a specification.

Steam-Turbines, of which the 'following is The present invention relatesto fsteam turbines and is illustrated as. applied' to v bines than theone illustrated.

mixed pressure turbines, z'. e., vturbines that areoperated b v lowpressure steam, or by a mixture of low and high pressure steam, or byhigh'pressure steam only; but the invention is applicable to other typesof tur'- The iiivention has for its object to-.i mprove theconstruction.l and 'operation of such turbines and their controlling I'neclia' nism whereby said turbines will utilize thesteam to lbette'radvantage than heretofore.

The accompanying drawing is a sectional view of la'turbine .showing anillustrative embodimfent of our 'inventiori. ln the `ii'st or high.pressure section of the turbine we employ several -wheels or severalrows of buckets with their coperating in terniediate buckets andabstract the'velocity' of the steam fractionally by successiveopcrations. A single larger wli'eel can be used if preferred. Lowpressure steam is admitted to the low pressure stages through' the pipeZ5 containing a throttle valveti. The turbine is intended to be operatedby this low pressure steam to as large an extent as possible. Live o rhigh pressure steam is used to supplement-the low pressure supply whenthe latter is insufficient to meet the de mand of the turbine. The pipebeyond thevalvc 2o is divided in order to supply the low pressureconduit 9 and the second lonT pressure,I conduit i0. The conduit 9 isused when the supply of low pressure steam is relatively small becauseit le`ads to alregion where the steam passages are of relatively smallcross section and therefore adapted 'to etiiciently handle the smallervolume of Then the supply of low pressure stcain is iio'ruial 'it entersthe turbineby the conduit. 10. ln the former conduit is located a slideor othcrvalve Q7 for regulating ythe passage of steam vand in the lattera' valve 28. The stages of lowest pressure are divided into groups orregionsund slninting I Specification of Letters Patent. Appucaon ineaDecember 27, 19in seriai No. beson.

the amount of`fsteain y l LUDWG' CUBELIC, OF CHARLOTTENBURG, GEORG'FQBNER, 0F BERLIN, GERMANY, .ASSIGNORS T0 GENERL ELECTRIC COMPNY, A.CORPORATION 0F -NEW YORK.

. v A .y I

PatentedJiine3,1913.=

i them "is a'lpassaige 29 to which steam can enter underthel control ofslide -or other "suitable valves 3Q and 31. The valves may be `operatedbyik substantiallythe same mechas nism asI the valves of our co-peiidingapnovel features of tlielturbine shown but not claimed herein areclaimed in said application. VFor low pressiire operation with steamentering the conduit 10 allof the subsequent stages-will bein serviceand the valves 30 and 31 will be closed. For mixed ressur'e' operation.highi pressure steam ii'om the pipe 12 will ente the .admission nozzle 7and low pressure steam will enter by the conduit 9 in'which case valve28 will be closed and valve 27 open. As to the last 4tvvo groupsofstages one or@ both may be cut out.

Opening valve 81 and "i closing valve 30 results in shunting the lastgroup of stages Whichiis the arrangement we prefer under saidcircumstances. VVhen operating with stages The reason for cutting outstages isllthat the high pressure steam contains musi-,more energy thanthe low pressure steam and hence a smaller totalxvolume is passedthrough the machine. Since the working passi'ges in the eXtreme lowpressure stages are uielatively large for that would ass through themunder conditions of mixed pressure or high pressi reoperation, and

The

highpressure steam alone, the valve 30 is-V .opened to shunt l bothsince failure to p'roperl till the passa es results in uneconomicaloiieration, We pre er to so design the turbin as a whole that thesestages ni'ay cut crease the efficiency by using only such sta ges tion.The di'lferent con itions of operation will determine'whether one ormore of-said lou' pressure groups of; stages will be cut out. f I v lnaccordance with the provisions of the 'patent statutes. we have'described tlieprinciple of operation of out' invention, together out andthereby in as are capable of effectve, economical ac fluid to the videdinto a plurality of stages, a conduit for admitting binea conduit` foradmitting low pressure tluid to the turbine', and means for changing thenumber oit active W 'pressure fluid stages When the turbine is operatingon steam supplied Wholly er in part. by the high pressureeonduit. e

2. In combination, a steam turbine divided into a plurality of stages,conduits admitting high and low pressure motive turbine, controllingvalves therefor, and valve means for changing the number ot'aetive leu7pressure stages..

Sfln combination, a steam turbine divided into a, plurality 01"" stages,a conduit admitting-high pressure motive tluid to the turbine, conduitsadmitting low pressure motive fluid -to stages of the turbine etditiierent pressures, and Valve mechanism fer vcontrolling the number etactive lewpressure stages.

4. In combination, a steam turbine divided into a plurality of stages, aconduit admitting-high pressure motive tluid to the turbine, conduitsadmitting low pressure high pressure fluid to the turmotive fluidto'stages of the turbine of different pressures, valve mechanism forcontrolling the passage of Huid through said conduits, and means forcutting out one or more stages when the turbine is operating on themixed or high pressure plan.

5. In combination, a multi-stage turbine comprising a stage thatutilizes Vhigh pressure lluid only, one or more stages that no1'- mallyutilize 10W pressure but which utilize high pressure fluid only when theturbine is operating on the mixed pressure plan, and stages thatnormallyntilize low pressure tiuid but which utilize both low and highpressurel'luid when the turbine is operating on the mixed pressure plan,and means for cutting out certain et the low pressure stages when theturbine is operating on the mixed or high pressure plan.

In witness whereof, We have hereunto set our hands.

LUDWIG CUBELIC. GEORG FORNER. lVitnesses FRANZ SGHOERNER,

FRIEDRICH Gimznnr.

Copies ofA this patent may be obtained for ve cents each, by addressingthe Commissioner of Patents,

Washington, D. C..

